Today most motor vehicles contain a four stroke diesel engine. The process of this four stroke diesel engines is as follows:
First the intake valves open allowing air into the cylinder and forcing the initial downward motion of the pistons.
Second, the pistons move back up and compress the air and Finally as the piston reaches the top, the fuel is injected and the air, having been heated by the act of compression, ignites the fuel and the combustion forces the piston back down; fourth, the piston moves back to the top, pushing out the exhaust created from the combustion as opposed to a gasoline engine that uses a spark from a sparkplug to ignite the fuel air mixture.
Diesel engines are more fuel efficient than their gasoline counterparts, resulting in lower fuel consumption; a common margin is 40% more miles per gallon for an efficient turbo diesel. Diesel engines also produce very little carbon monoxide as they burn the fuel in excess air even at full load.
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Tags: fuel consumption, diesel engine, miles per gallon, gasoline engine, hybrid cars, internal combustion, chemical energy, diesel engines, downward motion, inefficiency, crankshaft, gasoline engines, mechanical energy, machinations
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Source: http://www.articlealley.com/article_984006_31.html
